Buying a used car without checking its history is like hiring someone without looking at their resume. A vehicle history report takes five minutes and can save you from buying a flood-damaged, salvage-titled, or odometer-rolled car. Here's exactly what to do.
The Vehicle Identification Number (VIN) is the unique 17-character code that identifies every car. You need this before you can pull any history. Find it:
Make sure the VIN on the dashboard matches the one on the door jamb — a mismatch is a serious red flag for a stolen or rebuilt vehicle.
The two main providers are Carfax and AutoCheck. Both pull from insurance claims, state DMV records, auction data, and dealer service records. A single report costs around $40–$45, or you can get unlimited reports for ~$60.
Many dealerships offer free Carfax reports on their listings. If buying privately, it's worth paying for one yourself — don't rely on a report the seller provides.
A salvage title means the car was declared a total loss by an insurance company — usually due to a major accident, flood, or theft. A "rebuilt" title means it was repaired and passed a state inspection, but it was still totaled once. These cars are harder to insure and finance, and they're worth significantly less. Approach with caution.
Never buy a flood-damaged car. Electrical and corrosion problems can take years to show up and cost more than the car is worth.
If the reported odometer readings jump backward between records, the mileage has likely been tampered with. This is illegal but still happens in private sales. The vehicle history report will flag inconsistencies if they show up in the reporting data.
If a 3-year-old car has had 4 owners, someone kept selling it quickly. That often means recurring problems that buyers discovered after purchase.
A long gap with no service entries doesn't always mean something's wrong — not all shops report to Carfax. But it's worth asking the seller about maintenance during that period.
Go to nhtsa.gov/recalls and enter the VIN. This shows any open safety recalls that haven't been fixed. Recalls are free to repair at any authorized dealership, but if the previous owner ignored them, you inherit the problem. An open recall isn't a dealbreaker, but confirm the dealer will fix it before or at purchase.
Vehicle history reports are only as good as what gets reported. Private repairs, cash-paid accident fixes, and mechanical issues that were never insured won't show up. That's why a pre-purchase inspection by a mechanic ($100–$150) is still essential, even after a clean Carfax.
Once you've checked the history, use our calculator to see if the price is fair.
Used Car Value Calculator →These won't replace a full paid report, but they're a useful starting point before you pay.
Carfax is the better-known service and has a larger network of data sources, particularly from dealerships, auctions, and state DMV records. AutoCheck is Experian's competing product and is often used by dealers at auctions. For private purchases, Carfax is generally preferred because its data network is broader for consumer-reported accidents and service records.
The main difference: Carfax reports are priced per report ($44.99 for one, or $59.99 for unlimited for a limited time), while AutoCheck sells in bundles. If you're shopping seriously and checking multiple vehicles, the Carfax unlimited package often makes sense. If you're close to a decision on one specific car, a single report is fine.
Running both isn't necessary for most buyers, but some automotive professionals check both because they draw from partially different databases. AutoCheck occasionally catches accident or title issues that Carfax missed, and vice versa. If you're considering a higher-value vehicle ($20,000+) and something feels slightly off, running both is a $40 insurance policy.
The top section of a Carfax report shows the title history — this is the most important section. Look for any "branded" titles: salvage, rebuilt, flood, lemon law buyback, or fire. Any of these require a significant discount and careful inspection before purchasing. Clean title means none of these apply.
The ownership history tells you how many owners the vehicle has had and approximately when transfers occurred. Multiple owners in a short period on a newer vehicle is worth investigating — it may indicate recurring problems that previous owners discovered. One careful long-term owner is generally the most desirable history.
The accident and damage section shows reported incidents. Note that this only includes accidents reported to insurance — minor fender-benders that were repaired privately won't appear. A "no reported accidents" Carfax doesn't mean the car was never in an accident; it means no insurance claim was filed. This is why the pre-purchase inspection remains essential.
The odometer readings section shows mileage logged at each reporting event (registrations, service visits, sales). If the numbers aren't consistently increasing over time, flag it immediately. A reading of 80,000 miles in 2023 followed by 72,000 miles in 2024 is clear evidence of odometer rollback.
A clean vehicle history report is necessary but not sufficient. History reports only capture what was reported — significant mechanical issues, private collision repairs, and deferred maintenance leave no trace in any database. A pre-purchase inspection by an independent mechanic (not the selling dealer's shop) fills the gap between the paper history and the vehicle's actual current condition.
Budget $100–$175 for a thorough inspection. The mechanic should check the engine and transmission, suspension and steering components, brakes, tires, all fluid levels and conditions, body panel alignment (for evidence of hidden collision work), frame straightness, and perform an OBD diagnostic scan to check for stored fault codes. Any seller who refuses to allow an independent inspection is showing you a red flag — walk away.
For electric vehicles, ask the mechanic to check battery health specifically, including state of health (SOH) diagnostics if possible. Third-party battery health checks are available for Teslas and many other EVs and provide data the standard inspection doesn't cover.
The vehicle history report shows odometer readings at each reporting event, but there can be gaps. For additional verification, look at the wear patterns: seat bolster wear, steering wheel wear, pedal wear, and interior wear should all be consistent with the claimed mileage. An 80,000-mile car with a nearly pristine interior and minimal pedal wear is suspicious. Conversely, heavy interior wear on a claimed 40,000-mile vehicle is worth questioning.
For older vehicles, look at the service sticker often placed inside the driver's door or in the windshield corner — oil change records often show date and mileage, providing an independent data point.
After checking the history, use our calculator to verify you're paying a fair price.
Used Car Value Calculator →